Magadiite
A valid IMA mineral species
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About Magadiite
Formula:
Na2Si14O29 · 11H2O
Colour:
White
Hardness:
2
Specific Gravity:
2.25 (Calculated)
Crystal System:
Orthorhombic
Name:
Named for the type locality Lake Magadi.
Type Locality:
This page provides mineralogical data about Magadiite.
Unique Identifiers
Mindat ID:
2530
Long-form identifier:
mindat:1:1:2530:6
Similar Names
| Makatite | A valid IMA mineral species | Na2Si4O8(OH)2 · 4H2O |
IMA Classification of Magadiite
Approved
IMA Formula:
[Na2(H2O)8]Si14O28(OH)2
Approval year:
1967
First published:
1967
Classification of Magadiite
9.EA.20
9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
78.7.12.1
78 : Unclassified Silicates
7 :
78 : Unclassified Silicates
7 :
14.1.5
14 : Silicates not Containing Aluminum
1 : Silicates of the alkali metals
14 : Silicates not Containing Aluminum
1 : Silicates of the alkali metals
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Mgd | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Mgd | Warr (2020) | Warr, L.N. (2020) Recommended abbreviations for the names of clay minerals and associated phases. Clay Minerals, 55, 261–264 doi:10.1180/clm.2020.30 |
Physical Properties of Magadiite
Transparency:
Translucent, Opaque
Colour:
White
Streak:
White
Hardness:
2 on Mohs scale
Comment:
Tenacity: Puttylike
Density:
2.25 g/cm3 (Calculated)
Optical Data of Magadiite
Type:
Biaxial
RI values:
nα = 1.47
Surface Relief:
Moderate
Dispersion:
relatively weak
Chemistry of Magadiite
Mindat Formula:
Na2Si14O29 · 11H2O
Element Weights:
Elements listed:
Common Impurities:
Ti,Al,Fe,Mn,Mg,Ca,K
Crystallography of Magadiite
Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Fdd2
Cell Parameters:
a = 10.5035(9) Å, b = 10.0262(9) Å, c = 61.9608(46) Å
Ratio:
a:b:c = 1.048 : 1 : 6.18
Unit Cell V:
6,525.10 ų (Calculated from Unit Cell)
Morphology:
Putty-like laminae to very thin platy.
Comment:
Space Group: F2dd; Z undetermined
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0012231 | Magadiite | Garces J M, Rocke S C, Crowder C E, Hasha D L (1988) Hypothetical structures of magadiite and sodium octosilicate and structural relationships between the layered alkali metal silicates and the mordenite- and pentasil-group zeolites Clays and Clay Minerals 36 409-418 | 1988 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 15.41 Å | (100) |
| 3.44 Å | (80) |
| 3.146 Å | (50) |
| 3.30 Å | (35) |
| 5.18 Å | (19) |
| 4.46 Å | (18) |
| 5.01 Å | (16) |
Comments:
Lake Magadi, Kenya. The data are from the type description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 3a: Earth’s earliest Hadean crust | >4.50 |
| 10 : Basalt-hosted zeolite minerals | |
| Stage 3b: Earth’s earliest hydrosphere | >4.45 |
| 14 : Hot springs, geysers, and other subaerial geothermal minerals | |
| 16 : Low-? aqueous alteration of Hadean subaerial lithologies (see also #23) | |
| Near-surface Processes | |
| 25 : Evaporites (prebiotic) | |
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 35 : Ultra-alkali and agpaitic igneous rocks |
Type Occurrence of Magadiite
General Appearance of Type Material:
White putty-like laminae, in beds varying in thickness from 5 cm to 60 cm.
Place of Conservation of Type Material:
National School of Mines, Paris, France.
National Museum of Natural History, Washington, D.C., USA, 121336.
National Museum of Natural History, Washington, D.C., USA, 121336.
Geological Setting of Type Material:
Evaporite from saline brine.
Associated Minerals at Type Locality:
Synonyms of Magadiite
Other Language Names for Magadiite
Common Associates
Associations Based on Photo Data:
| 5 photos of Magadiite associated with Kenyaite | Na2Si22O41(OH)8 · 6H2O |
| 3 photos of Magadiite associated with Stishovite | SiO2 |
| 3 photos of Magadiite associated with Coesite | SiO2 |
| 3 photos of Magadiite associated with Microcline | K(AlSi3O8) |
| 2 photos of Magadiite associated with Varennesite | Na8Mn2Si10O25(OH,Cl)2 · 12H2O |
| 2 photos of Magadiite associated with Silhydrite | Si3O6 · H2O |
| 1 photo of Magadiite associated with Aegirine | NaFe3+Si2O6 |
| 1 photo of Magadiite associated with Quartz | SiO2 |
| 1 photo of Magadiite associated with Calcite | CaCO3 |
| 1 photo of Magadiite associated with Pectolite | NaCa2Si3O8(OH) |
Related Minerals - Strunz-mindat Grouping
| 9.EA. | Hydroxymcglassonite-(K) | KSr4Si8O20(OH) · 8H2O |
| 9.EA. | Miyawakiite-(Y) | ◻Y4Fe2(Si8O20)(CO3)4(H2O)3 |
| 9.EA. | Bussyite-(Y) | (Y,REE,Ca)3(Na,Ca)6MnSi9Be5(O,OH,F)34 |
| 9.EA. | Fluorapophyllite-(NH4) | NH4Ca4(Si8O20)F · 8H2O |
| 9.EA.05 | Gillespite | BaFe2+Si4O10 |
| 9.EA.05 | Cuprorivaite | CaCuSi4O10 |
| 9.EA.05 | Wesselsite | SrCuSi4O10 |
| 9.EA.05 | Effenbergerite | BaCuSi4O10 |
| 9.EA.07 | Fluorapophyllite-(Cs) | CsCa4(Si8O20)F · 8H2O |
| 9.EA.10 | Ekanite | Ca2ThSi8O20 |
| 9.EA.15 | Fluorapophyllite-(Na) | NaCa4(Si8O20)F · 8H2O |
| 9.EA.15 | Fluorapophyllite-(K) | KCa4(Si8O20)(F,OH) · 8H2O |
| 9.EA.15 | Hydroxyapophyllite-(K) | KCa4(Si8O20)(OH,F) · 8H2O |
| 9.EA.25 | Dalyite | K2ZrSi6O15 |
| 9.EA.25 | Davanite | K2TiSi6O15 |
| 9.EA.30 | Sazhinite-(La) | Na3La[Si6O15] · 2H2O |
| 9.EA.30 | Sazhinite-(Ce) | Na3CeSi6O15 · 2H2O |
| 9.EA.35 | Armstrongite | CaZr[Si6O15] · 3H2O |
| 9.EA.40 | Okenite | Ca10Si18O46 · 18H2O |
| 9.EA.45 | Perettiite-(Y) | Y2Mn4FeSi2B8O24 |
| 9.EA.45 | Nekoite | Ca3Si6O15 · 7H2O |
| 9.EA.45 | Badakhshanite-(Y) | Y2Mn4Al(Si2B7BeO24) |
| 9.EA.47 | Shlykovite | KCa[Si4O9(OH)] · 3H2O |
| 9.EA.50 | Diegogattaite | Na2CaCu2Si8O20 · H2O |
| 9.EA.50 | Cavansite | Ca(VO)Si4O10 · 4H2O |
| 9.EA.52 | Yangite | PbMnSi3O8 · H2O |
| 9.EA.55 | Pentagonite | Ca(VO)Si4O10 · 4H2O |
| 9.EA.60 | Penkvilksite | Na4Ti2Si8O22 · 4H2O |
| 9.EA.60 | Tumchaite | Na2Zr(Si4O11) · 2H2O |
| 9.EA.65 | Nabesite | Na2BeSi4O10 · 4H2O |
| 9.EA.70 | Ajoite | (K,Na)Cu7AlSi9O24(OH)6 · 3H2O |
| 9.EA.75 | Zeravshanite | Na2Cs4Zr3[Si18O45]*2H2O |
| 9.EA.80 | Bussyite-(Ce) | (Ce,REE)3(Na,H2O)6MnSi9Be5(O,OH)30F4 |
| 9.EA.85 | Plumbophyllite | Pb2Si4O10 · H2O |
Other Information
Notes:
Magadiite in dilute acid at room temperature produces a hydrous form of silica. Subsequent treatment of the silica with concentrated solutions of Na2CO3 or NaOH produces magadiite again.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Magadiite
mindat.org URL:
https://www.mindat.org/min-2530.html
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References for Magadiite
Reference List:
Eugster, H. P. (1967) Hydrous Sodium Silicates from Lake Magadi, Kenya: Precursors of Bedded Chert. Science, 157 (3793). 1177-1180 doi:10.1126/science.157.3793.1177
McAtee, J. L., House, R., Eugster, H. P. (1968) Magadiite from Trinity County, California. American Mineralogist, 53 (11-12) 2061-2069
Bricker, Owen P. (1969) Stability constants and Gibbs free energies of formation of magadiite and kenyaite. American Mineralogist, 54 (7-8) 1026-1033
Brindley, G. W. (1969) Unit cell of magadiite in air, in vacuo and under other conditions. American Mineralogist, 54 (11-12) 1583-1591
Lagaly, Gerhard, Beneke, Klaus, Weiss, Armin (1975) Magadiite and H-magadiite: I. Sodium magadiite and some of its derivatives. American Mineralogist, 60 (7-8) 642-649
Lagaly, Gerhard, Beneke, Klaus, Weiss, Armin (1975) Magadiite and H-magadiite: II. H-magadiite and its intercalation compounds. American Mineralogist, 60 (7-8) 650-658
Fletcher, Ross A. (1987) Synthesis of Kenyaite and Magadiite in the Presence of Various Anions. Clays and Clay Minerals, 35 (4) 318-320 doi:10.1346/ccmn.1987.0350410
Scholzen, G., Beneke, K., Lagaly, G. (1991) Diversity of Magadiite. Zeitschrift für anorganische und allgemeine Chemie, 597 (1). 183-196 doi:10.1002/zaac.19915970121
KOSUGE, Katsunori, YAMAZAKI, Atsushi, TSUNASHIMA, Atsumu, OTSUKA, Ryohei (1992) Hydrothermal Synthesis of Magadiite and Kenyaite. Journal of the Ceramic Society of Japan, 100 (1159) 326-331 doi:10.2109/jcersj.100.326
Almond, Graham G., Harris, Robin K., Franklin, Kevin R. (1997) A structural consideration of kanemite, octosilicate, magadiite and kenyaite. Journal of Materials Chemistry, 7. 681-687 doi:10.1039/a606856a
Eypert-Blaison, C., Villiéras, F., Michot, L. J ., Pelletier, M., Humbert, B., Ghanbaja, J ., Yvon, J . (2002) Surface heterogeneity of kanemite, magadiite and kenyaite: a high-resolution gas adsorption study. Clay Minerals, 37 (3) 531-542 doi:10.1180/0009855023730056
Wang, Yuh-Ruey, Wang, Sea-Fue, Chang, Li-Chung (2006) Hydrothermal synthesis of magadiite. Applied Clay Science, 33. 73-77 doi:10.1016/j.clay.2006.02.001
Localities for Magadiite
Showing 15 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Bolivia | |
| Abdelouas et al. (1995) |
Canada | |
| Grice (1989) +1 other reference |
| Horváth et al. (1998) |
| Horváth et al. (1998) | |
Chad | |
| Fletcher (1987) | |
Kenya | |
| Périnet et al. (1982) |
| New data on minerals. M.: 2003. Volume ... +3 other references |
Namibia | |
| ... +1 other reference |
Niger | |
| Sebag et al. (2001) |
Russia | |
| webmineral.ru (n.d.) +1 other reference |
Sudan | |
| Mees et al. (1991) |
USA | |
| Bricker (1969) +2 other references |
| Lukasz Kruszewski specimen. +7 other references |
| Matthews (1992) |
| Rooney et al. (1969) |
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Lake Magadi, Kajiado County, Kenya